S3 (Rhine-Main S-Bahn)
The S3 service of the S-Bahn Rhein-Main system bearing the KBS number 645.3
Lines
City tunnel
The city tunnel is an underground, pure S-Bahn route used by almost all services.History
The S3 was one of the first six services of the Rhine-Main S-Bahn system. In a prior test operation it ran between Frankfurt-Höchst and Frankfurt Central Station. The service was then called R3 where the letter "R" stands for regional. After the opening of the Frankfurt Citytunnel the service was renamed to S3 and extended to the new Hauptwache underground station. Further extensions of the tunnel followed in 1983 and 1990 so that the Südbahnhof became the service's eastern terminal.Operation
- Bad Soden – Frankfurt Süd